Red Sox right-hander Daisuke Matsuzaka has returned to Japan. Matsuzaka has a sprained ulnar collateral ligament in his right elbow, which could eventually lead to Tommy John surgery. He has been on the disabled list five times in the last two years. "Matsuzaka's tack with the Red Sox, according to sources inside and outside the organization, has been simple: Ignore what they want and do what he wants," writes Jeff Passan of Yahoo! Sports.